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Cross-platform, open-source text string encryptor. https://github.com/a3diti/aes256-offline/
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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QR-Code-generator
High-quality QR Code generator library in Java, TypeScript/JavaScript, Python, Rust, C++, C.
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keepassxc
KeePassXC is a cross-platform community-driven port of the Windows application “Keepass Password Safe”.
KeepassXC: https://keepassxc.org/
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Cross-platform, open source QR code generators: https://kazuhikoarase.github.io/qrcode-generator/js/demo/
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See BIP-39
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TordlWalletProtocols
This repository documents various methods for securely backing up and storing bitcoins.
I suggest checking out The Tordl Wallet Protocols which are holistic guides for how to securely self custody your bitcoin. It includes guidance on how to store your seeds.